轉載自??MySQL dayname()函數

MySQL DAYNAME函數介紹

MySQL?DAYNAME函數返回指定日期的工作日的名稱。 以下說明了DAYNAME函數的語法：

DAYNAME(date);

DAYNAME函數接受1個參數，該參數是要獲取其工作日名稱的日期。

如果日期為NULL或無效，例如2017-02-30，DAYNAME函數將返回NULL。

MySQL DAYNAME函數示例

以下示例將返回2018年1月1日的工作日名稱。

mysql> SELECT DAYNAME('2018-01-01') dayname; +---------+ | dayname | +---------+ | Monday | +---------+ 1 row in set

默認情況下，MySQL返回由lc_time_names系統變量控制的語言中的工作日的名稱，查詢當前lc_time_names變量設置的值，如下 -

mysql> SELECT @@lc_time_names; +-----------------+ | @@lc_time_names | +-----------------+ | en_US | +-----------------+ 1 row in set

您可以看到，目前區域設置設置為en_US。

要在特定區域設置中獲取日期名稱一個工作日，您需要更改lc_time_names變量的值。 例如，以下語句將語言環境設置為中文：

mysql> SET @@lc_time_names = 'zh_CN'; Query OK, 0 rows affected

現在，我們來查詢2018年1月1日的工作日名稱：

mysql> SELECT DAYNAME('2018-01-01') dayname; +---------+ | dayname | +---------+ | 星期一 | +---------+ 1 row in set

您可以看到，工作日名稱已更改為中文：星期一。

下表顯示了MySQL所支持的lc_time_names系統變量的有效語言環境的值：

國家編/代碼

Albanian – Albania	sq_AL
Arabic – Algeria	ar_DZ
Arabic – Bahrain	ar_BH
Arabic – Egypt	ar_EG
Arabic – India	ar_IN
Arabic – Iraq	ar_IQ
Arabic – Jordan	ar_JO
Arabic – Kuwait	ar_KW
Arabic – Lebanon	ar_LB
Arabic – Libya	ar_LY
Arabic – Morocco	ar_MA
Arabic – Oman	ar_OM
Arabic – Qatar	ar_QA
Arabic – Saudi Arabia	ar_SA
Arabic – Sudan	ar_SD
Arabic – Syria	ar_SY
Arabic – Tunisia	ar_TN
Arabic – United Arab Emirates	ar_AE
Arabic – Yemen	ar_YE
Basque – Basque	eu_ES
Belarusian – Belarus	be_BY
Bulgarian – Bulgaria	bg_BG
Catalan – Spain	ca_ES
Chinese – China	zh_CN
Chinese – Hong Kong	zh_HK
Chinese – Taiwan Province of China	zh_TW
Croatian – Croatia	hr_HR
Czech – Czech Republic	cs_CZ
Danish – Denmark	da_DK
Dutch – Belgium	nl_BE
Dutch – The Netherlands	nl_NL
English – Australia	en_AU
English – Canada	en_CA
English – India	en_IN
English – New Zealand	en_NZ
English – Philippines	en_PH
English – South Africa	en_ZA
English – United Kingdom	en_GB
English – United States	en_US
English – Zimbabwe	en_ZW
Estonian – Estonia	et_EE
Faroese – Faroe Islands	fo_FO
Finnish – Finland	fi_FI
French – Belgium	fr_BE
French – Canada	fr_CA
French – France	fr_FR
French – Luxembourg	fr_LU
French – Switzerland	fr_CH
Galician – Spain	gl_ES
German – Austria	de_AT
German – Belgium	de_BE
German – Germany	de_DE
German – Luxembourg	de_LU
German – Switzerland	de_CH
Greek – Greece	el_GR
Gujarati – India	gu_IN
Hebrew – Israel	he_IL
Hindi – India	hi_IN
Hungarian – Hungary	hu_HU
Icelandic – Iceland	is_IS
Indonesian – Indonesia	id_ID
Italian – Italy	it_IT
Italian – Switzerland	it_CH
Japanese – Japan	ja_JP
Korean – Republic of Korea	ko_KR
Latvian – Latvia	lv_LV
Lithuanian – Lithuania	lt_LT
Macedonian – FYROM	mk_MK
Malay – Malaysia	ms_MY
Mongolia – Mongolian	mn_MN
Norwegian – Norway	no_NO
Norwegian(Bokm?l) – Norway	nb_NO
Polish – Poland	pl_PL
Portugese – Brazil	pt_BR
Portugese – Portugal	pt_PT
Romanian – Romania	ro_RO
Russian – Russia	ru_RU
Russian – Ukraine	ru_UA
Serbian – Yugoslavia	sr_RS
Slovak – Slovakia	sk_SK
Slovenian – Slovenia	sl_SI
Spanish – Argentina	es_AR
Spanish – Bolivia	es_BO
Spanish – Chile	es_CL
Spanish – Columbia	es_CO
Spanish – Costa Rica	es_CR
Spanish – Dominican Republic	es_DO
Spanish – Ecuador	es_EC
Spanish – El Salvador	es_SV
Spanish – Guatemala	es_GT
Spanish – Honduras	es_HN
Spanish – Mexico	es_MX
Spanish – Nicaragua	es_NI
Spanish – Panama	es_PA
Spanish – Paraguay	es_PY
Spanish – Peru	es_PE
Spanish – Puerto Rico	es_PR
Spanish – Spain	es_ES
Spanish – United States	es_US
Spanish – Uruguay	es_UY
Spanish – Venezuela	es_VE
Swedish – Finland	sv_FI
Swedish – Sweden	sv_SE
Tamil – India	ta_IN
Telugu – India	te_IN
Thai – Thailand	th_TH
Turkish – Turkey	tr_TR
Ukrainian – Ukraine	uk_UA
Urdu – Pakistan	ur_PK
Vietnamese – Viet Nam vi_VN

請參閱示例數據庫(yiibaid)中的以下orders表：

mysql> desc orders; +----------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+-------------+------+-----+---------+-------+ | orderNumber | int(11) | NO | PRI | NULL | | | orderDate | date | NO | | NULL | | | requiredDate | date | NO | | NULL | | | shippedDate | date | YES | | NULL | | | status | varchar(15) | NO | | NULL | | | comments | text | YES | | NULL | | | customerNumber | int(11) | NO | MUL | NULL | | +----------------+-------------+------+-----+---------+-------+ 7 rows in set

以下語句返回2014年按工作日名稱分組的訂單計數。

SELECT DAYNAME(orderdate) weekday, COUNT(*) total_orders FROMorders WHEREYEAR(orderdate) = 2004 GROUP BY weekday ORDER BY total_orders DESC;

執行上面查詢語句，得到以下結果 -

+---------+--------------+ | weekday | total_orders | +---------+--------------+ | 星期三 | 37 | | 星期一 | 28 | | 星期日 | 27 | | 星期二 | 22 | | 星期六 | 21 | | 星期四 | 14 | | 星期五 | 2 | +---------+--------------+ 7 rows in set

星期三的訂單數量是最高的，星期五有兩個訂單。

在本教程中，您已經學習了如何使用MySQL DAYNAME函數獲取特定日期的工作日名稱。

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